title: Stable isotope-labeled vitamin D, metabolites and chemical analogs: synthesis and use in mass spectrometric studies.
abstract: Methods for the measurement of vitamin D and its metabolites using stable isotope-labeled internal standards and mass spectrometry are reviewed. The synthesis of both labeled and unlabeled standards is illustrated, and details of the synthesis of (26,26,27,27,27(-2)H5)-25,26-dihydroxyvitamin D3 and (28,28,28(-2)H3)-24,25-dihydroxyvitamin D2 are given. The use of in vitro biologic systems for the production of further metabolites of deuterated 25-hydroxyvitamin D3 is discussed. Use of deuterated 25-hydroxydihydrotachysterol3 as a substrate in the isolated perfused rat kidney has provided valuable data for the assignment of structure to a number of metabolites of 25-hydroxydihydrotachysterol3 formed in this system.
authors.affiliation: Department of Chemical Pathology, London Hospital Medical College, UK.
authors.forename: R D
authors.initials: RD
authors.lastname: Coldwell
authors.forename: D J
authors.initials: DJ
authors.lastname: Trafford
authors.forename: M J
authors.initials: MJ
authors.lastname: Varley
authors.forename: D N
authors.initials: DN
authors.lastname: Kirk
authors.forename: H L
authors.initials: HL
authors.lastname: Makin
mesh_terms: D000818:Animals; D003903:Deuterium; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D007553:Isotope Labeling; D015394:Molecular Structure; D014807:Vitamin D / Q000031:analogs & derivatives / Q000138:chemical synthesis / Q000737:chemistry / Q000378:metabolism
chemical_list: D014807:Vitamin D; D003903:Deuterium